2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.sal.core.spi.data;
10 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
12 import javax.annotation.Nonnull;
13 import org.opendaylight.yangtools.concepts.ListenerRegistration;
14 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
17 * Interface implemented by DOMStore implementations which allow registration
18 * of {@link DOMDataTreeChangeListener} instances.
20 public interface DOMStoreTreeChangePublisher {
22 * Registers a {@link DOMDataTreeChangeListener} to receive
23 * notifications when data changes under a given path in the conceptual data
26 * You are able to register for notifications for any node or subtree
27 * which can be represented using {@link YangInstanceIdentifier}.
30 * You are able to register for data change notifications for a subtree or leaf
31 * even if it does not exist. You will receive notification once that node is
34 * If there is any pre-existing data in data tree on path for which you are
35 * registering, you will receive initial data change event, which will
36 * contain all pre-existing data, marked as created.
39 * This method returns a {@link ListenerRegistration} object. To
40 * "unregister" your listener for changes call the {@link ListenerRegistration#close()}
41 * method on this returned object.
43 * You MUST explicitly unregister your listener when you no longer want to receive
44 * notifications. This is especially true in OSGi environments, where failure to
45 * do so during bundle shutdown can lead to stale listeners being still registered.
48 * Data tree identifier of the subtree which should be watched for
51 * Listener instance which is being registered
52 * @return Listener registration object, which may be used to unregister
53 * your listener using {@link ListenerRegistration#close()} to stop
54 * delivery of change events.
56 @Nonnull <L extends DOMDataTreeChangeListener> ListenerRegistration<L> registerTreeChangeListener(@Nonnull YangInstanceIdentifier treeId, @Nonnull L listener);